Hoisting or logging device.



W. H. UORBETT.

. HOISTING OR LOGGING DEVICE. APPLICATION FILED DBO.28,1907.

Patented Nov. 9, 1909.

WILLIAM I-IARRISON CORBETT, OF IEORTLAND, OREGON.

HOISTING OR LOGGING DEVICE.

Specification of Letters Patent.

Patented Nov. 9, 1999.

Application filed December as, 1907. semi No. 408,349.

To all auhom it may concern:-

Be 1t known that I, WILLIAM HARRrsoN 'ConnnTT, of Portland, ,Multnomahcounty,

Oregon, have invented certain new and useful Improvements in Hoisting orLogging Devices, of which the following is a specification. j I

The object of my invention is to improve the apparatus shown anddescribed in Letters Patent of the United States, issued to me December12, 1905, No. 807 ,109.

The invention consists generally in various constructions'andcombinations, all as hereinafter described and particularly pointed outin the"claim.

In the accompanying drawings, forming part of this specification, Figurel is a side elevation partially in section, of a hoisting drum with myinventionapplied thereto. Fig. 2 is a detail sectional view illustratingthe construction of the clutch operating mechanism.

In the drawing, 2 represents a suitable base having bearlngs 3 at eachend for a shaft 4. A driving gear 5 is secured on this shaft andafriction cone 6 is arranged to revolve with said driving gear. A drum7.-

is loosely mounted on said shaft and is provided at one end with afriction band 8 inclosing the cone 6 and adapted to engage the same uponthe axial movement of the drum 7. A spring 9 on the shaft 4 tends tohold the friction band 8 out of contact with the cone 6. A collar 10 isprovided on the shaft 4 in contact with the drum 7 A key 11 is providedwithin a slot 12 in the said shaft and engages the collar 10 and isadapted to slide therewith back and forth in said shaft. The shaft 4 hasa threaded end A carrier 14 is screwed on to the end of the shaft and isrovided with a cover plate 15 held in place by bolts 16. The carriercorresponds substantially to the one shown in my patent above referredto and a-tniit i7 having an enlarged inner end 18 is journaled withinthe cover plate 15, and rings 19 jwith roller bearings 20 between themare interposed between the covcr plate and the enlarged inner end orhead 18. The nut 17 is interioii; threaded and is held against rotationby a clamp 21 and an arm 22. A

screw 23 is provided within the interiorly threaded end and has a head24 with means for applying a lever 24 thereto. A cylindrical chamber 25is provided at the inner end of the nut 17, said chamber extendingthrough the enlarged inner end or head 18 and being concentric with theinteriorly threaded outer end of said nut.

bushing 26, preferably of bronze, is provided within the chamber 25 andis freely movable therein, and oil holes 27 are provided in the wall ofthe nut 17 leading from the roller bearings to said chamber. A in 28 isprovided within the bushin 26 having its outer end in contact with the trust screw 23 and its inner end in contact with a pin 29 which engagesthe key 11.

Upon turning the screw 23 in one direction its thrust will be impartedthrough the pins 28 and 29 and the key 11 to the drum to compress thespring 9 and move the friction band 8 into contact with the cone 6.

' U pon turning the screw 23 the other way the thrust on the pins willbe relieved and the tension of the spring 9 will return the parts totheir normal inoperative position. This manner of operating the frictiondevice of a hoisting drum has been found to be very satisfactory. Themechanism is simple, the

operation quick and convenient, the only obstacle being the grinding ofthe thrust pm and shaft collar, which has sometimes caused seriousbreakdowns and delays. By usin the bronze bushing within the chamberpthe nut 17 I am able to increase the durabillty of this part of thedevice and provide a convenient and inexpensive construction in case ofnecessary repalrs, the bronze bushing being readily removable when wornor otherwise damaged, and a new one substituted therefor.

I claim as my invention:

The combination, with a shaft, of a drum loosely mounted thereon, afriction device for locking said drum and rendered operative by axialmovement-thereof in one direction, a carrier provided on one end of saidshaft, a nut within said carrier and having an intcriorly threadedsocket, and chamber in one end concentric with said socket, a

thrust screw fitting in said socket, a loose cylindrical bushingarranged within said chamber between one end of said shaft and Afloating Q r seems said. socket, said. bushingbeing oi? substam screwtosaid drum, substantially es deting Within said bushing and contactingwith the inner end of said thrust screw, and W1tnesses:

tially the same diameter from end to end scrlbed.

and having" e'longituciinal and rotary move In Witness. Wheiflf, I havehereunto set meht Within said chamber, a thrust pin.fitmy hand this 31stday 01" October 1907.

WILLIAM HARRISON CORBETT.

neans interpese'd between said pin and said R. E. DAVIS, drum fortransmitting the thrust of said M. H. INSLEY.

